I don't think we have an index of the 2DS by serial (and it would take a massive amount of work to start one now), however since it can run on lower firmwares the odds of getting one with less than 9.2 is way higher when compared to the N3DS.
edit: it's not as exact as one could hope but you might try looking for what year the copyright is. To be totally safe I would say anything copyright 2013, however unless you get unlucky with a 2014 system you should be fine as well.